Current code will exist when read eMMC 5.0, add support for it

Signed-off-by: Zhang Yi <yix.x.zh...@gmail.com>
---
 mmc_cmds.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/mmc_cmds.c b/mmc_cmds.c
index b8afa74..5edf42b 100644
--- a/mmc_cmds.c
+++ b/mmc_cmds.c
@@ -722,6 +722,9 @@ int do_read_extcsd(int nargs, char **argv)
        ext_csd_rev = ext_csd[192];
 
        switch (ext_csd_rev) {
+       case 7:
+               str = "5.0";
+               break;
        case 6:
                str = "4.5";
                break;
-- 
1.7.9.5

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